@r3pek @jerry That's an optional but very useful tag that terlls recipiants where they should send aggregate reports to you so you can troubleshoot #DMARC and track evil people trying to spoof you. I have another open source project called #parsedmarc that will manage these reports right out of your report inbox and ship parsed reports to Elasticsearch and/or Splunk. https://domainaware.github.io/parsedmarc/